This is an fantastic old school sci-fi book, overlooked by history. The narrative has the earth having been colonised centuries earlier by monstrous giant aliens, who came to earth and because of their technology and sheer size brushed humanity aside. Humans now live in the walls of their homes as vermin, stealing from their larders and being no more than a nuisance.
It follows humanity's petty struggles and its pathetic attempts to hit back at 'the monsters' in a very unusual but engaging way, and hit has a wonderfully twisted but satisfying conclusion. Would recommend!